Designed for the digital world and an expanding universe of metadata users, RDA: Resource Description and Access is the new unified cataloguing standard. The online RDA Toolkit subscription is the most effective way to interact with the new standard.
RDA Toolkit highlights:
Searchable and browseable RDA instructions
User-created Workflows, Maps, and other tools
Two views of RDA content—Table of Contents and RDA Element Set
Full text of AACR2 with links to RDA
Library of Congress Policy Statements